Smart phone and bluetooth earset having digital two-way radio function

ABSTRACT

A smart phone having a digital radio function includes a reception portion to which an analog voice signal is input, a first amplification portion to amplify the analog voice signal input through the reception portion, an A/D converter to convert the amplified analog voice signal into a digital voice signal, a control portion to receive and output the digital voice signal and to output a digital voice signal received and input through an antenna, an RF transceiver to control inputting the signal received through the antenna to the control portion and to transmit the signal output from the control portion through the antenna, a D/A converter to convert the digital voice signal into an analog voice signal, a second amplification portion to amplify the analog voice signal, and a voice output portion to externally transmit the analog voice signal output from the second amplification portion.

TECHNICAL FIELD

The present invention relates to a smart phone and a Bluetooth earset,for example, to a smart phone and a Bluetooth earset having a digitalradio function which allows transmission and reception to be performedat the same time using a time sharing method through a full duplexcommunication function.

BACKGROUND ART

A radio is a device used for wireless telegraph or a radiotelephony.When a radio is used, a base station or a relay station for mutualconnection is not necessary and a phone bill is not charged while mutualcommunication is performed. Due to these advantages, radios are used ina variety of fields. As examples thereof, a portable radio, a dailyradio, a vehicular radio, and a trunked radio system (TRS) radio areused in an industrial filed, a plant, hiking and reports fields inaddition to policemen.

A radio is configured to convert and output a signal received through anantenna through an external speaker to reproduce a received voice and totransmit a transmitted voice input through an external microphone.

However, a simplex or half duplex method is used in currently-providedradios, and particularly, in wearable radios which have been developedrecently.

Also, since a voice may be generally input by operating a push to talk(PTT) button in general radios which are currently provided and wearableradios which have been developed recently, a voice input process thereofis relatively inconvenient. Also, in the case of a wearable radio inwhich security is needed according to use, there is a disadvantage thata voice input operation is distinctly seen.

Also, since general radios, which are currently provided, and wearableradios, which have been developed recently, consume a large amount ofpower during a standby status, it is necessary to frequently replace abattery and a failure caused by battery depletion frequently occurs.

DISCLOSURE Technical Problem

The present invention is directed to providing a smart phone andBluetooth earset having a digital radio function, which performtransmission and reception at the same time using a time sharing methodwith a full duplex communication function.

The present invention is also directed to providing a smart phone andBluetooth earset in which since communication is available among deviceshaving the digital radio function in a communication group set through adivision function using a code combination, the communication among thedevices having the digital radio function in the correspondingcommunication group may be performed in a clear state in which noise andcrosstalk are prevented as much as possible.

The present invention is also directed to providing a smart phone andBluetooth earset which allow a user to automatically transmit a voicesignal input to a reception portion through a radio frequency (RF)transceiver and an antenna without additionally manipulating a push totalk (PTT) button and the like for inputting a voice.

The present invention is also directed to providing a smart phone andBluetooth earset which may remotely control transmission of anotherdevice having the digital radio function and in which a master-slaverelationship may be formed between a plurality of devices having thedigital radio function, voice conversations may be more efficientlyperformed among the devices having the digital radio function in whichthe master-slave relationship is formed.

The present invention is also directed to providing a smart phone andBluetooth earset which may set a communication group with other deviceshaving the digital radio function within a limited range by, forexample, converting and transmitting communication group settinginformation into a dual-tone multi-frequency (DTMF) signal ortransmitting communication group setting information including a certainreceived signal strength indicator (RSSI) reference value.

Technical Solution

One aspect of the present invention provides a smart phone or Bluetoothearset having a digital radio function. The smart phone or Bluetoothearset includes a reception portion to which an analog voice signal isinput, a first amplification portion amplifying the analog voice signalinput through the reception portion, an analog/digital (A/D) converterconverting the amplified analog voice signal output by the firstamplification portion into a digital voice signal, a control portionreceiving and outputting the digital voice signal output from the A/Dconverter and outputting a digital voice signal received and inputthrough an antenna, a radio frequency (RF) transceiver controllinginputting the signal received through the antenna to the control portionand transmitting the signal output from the control portion through theantenna; a digital/analog (D/A) converter converting the digital voicesignal output from the control portion into an analog voice signal; asecond amplification portion amplifying the analog voice signal outputfrom the D/A converter, and a voice output portion externallytransmitting the analog voice signal output from the secondamplification portion. Here, the control portion enables full duplexcommunication with another wireless communication device by controllinga time sharing function of the antenna.

The control portion may set a group of other devices having the digitalradio function which are capable of performing communication through asharing function using a code combination and enable communication onlyamong devices having the digital radio function in the set group.

The smart phone or Bluetooth earset may further include a comparatorconnected to an output end of the first amplification portion with theA/D converter in parallel to determine whether voice data is present inthe amplified analog voice signal output from the first amplificationportion. Here, the control portion may be connected to the A/D converterand the comparator in parallel and automatically output the digitalvoice signal input from the A/D converter to the RF transceiveraccording to a signal input from the comparator.

The smart phone or Bluetooth earset may further include an input portionfor inputting a signal including a push to talk (PTT) to the controlportion.

The smart phone may further include a display portion which is connectedto the control portion and displays a system setting value and statusinformation of the smart phone having the digital radio function on ascreen.

In the Bluetooth earset, a smart phone paired with the Bluetooth earsetmay be connected to the control portion and display a system settingvalue and status information of the Bluetooth earset having the digitalradio function on a screen

The control portion may output a signal to the RF transceiver whiledividing the signal into a basic packet and a control INST packet, thebasic packet may be a transmission and reception digital basic frameincluding voice data, and the control INST packet may be a frameincluding a control instruction set necessary in addition totransmission of the voice data and additionally and separatelytransmitted to the basic packet whenever an instruction occurs.

The basic packet may include a preamble, a starter code, a transmissionID, a reception ID, a pairing code, a control INST, voice data, and acompletion code, and the control INST packet may include a packet delay,a slot number, a slot ranking, a master, a slave, remote transmission,Reserve 1, and Reserve 2.

The master and the slave of the control INST packet may includeinformation on a master that distributes a control instruction set andinformation a slave that receives the control instruction setdistributed by the master, and also include information that the mastertransfers authority of distributing the control instruction set to aparticular slave.

The remote transmission of the control INST packet may includeinformation on transmission control and exclusive reception of a masterwith respect to a particular slave.

A slot number n and a slot ranking N may be indicated in the slot numberand the slot ranking of the control INST packet such that when a numberof communicators in the communication group exceeds the slot number n, anew communicator may enter the slot number while replacing acommunicator of a last ranking N to perform communication (here, acommunicator with a slot number exceeding n in the group also alwaysperform reception from all the communicators).

A maximum time slot Tn of the basic packet may equal a packet delay T/aslot number n (here, the slot number n is an integer smaller than <amaximum transmission velocity/a general voice sampling velocity of 20kbps> and is extensible through data compression as necessary.)

In a standby status for receiving a signal from another device havingthe digital radio function through the antenna or a standby status forreceiving an analog voice signal from the other device through thereception portion, the control portion may remain in a sleep mode for apreset time and then operate in an auto-polling mode for a preset timeto repetitively perform conversion into the sleep mode and theauto-polling mode so as to reduce power consumption while standing byfor reception.

The control portion may transmit communication group setting informationto other devices having the digital radio function within a limitedrange so as to set a communication group with the other devices havingthe digital radio function.

The control portion may convert the communication group settinginformation into a dual-tone multi-frequency (DTMF) signal and transmitthe DTMF signal through the voice output portion, and when a DTMF signalis input through the reception portion, the control portion may obtaincommunication group setting information by decoding the input DTMFsignal.

The DTMF signal may have frequency components of a 4×4 matrix.

The control portion may transmit the communication group settinginformation including a certain received signal strength indicator(RSSI) reference value through the antenna. When communication groupsetting information is received through the antenna, the control portionmay extract an RSSI reference value from the received communicationgroup setting information and check the received communication settinginformation when a measured RSSI value is greater than or equal to theextracted RSSI reference value.

The communication group setting information may include a control INSTpacket, and the RSSI reference value may be included in an area ofReserve 1 or Reserve 2 of the control INST packet.

The communication group setting information may include ID, a pairingcode, a master, a slave, and a control INST of another device having thedigital radio function to be included in the communication group.

The control portion may amplify a signal received through the antennaand transmit the amplified signal through the antenna so as to allow thesmart phone or Bluetooth earset having the digital radio function toperform a repeater or relay function.

The control portion of the smart phone having the digital radio functionmay transmit a signal received from another device having the digitalradio function to a voice-over Internet protocol (VoIP) network andtransmit a signal received through the VoIP network to the other devicehaving the digital radio function so as to allow the smart phone havingthe digital radio function to operate as a donor radio.

Advantageous Effects

According to the embodiments of the present invention, a smart phone andBluetooth earset having a digital radio function may performtransmission and reception at the same time using a time sharing methodwith a full duplex communication function.

Also, since communication is available among devices having the digitalradio function in a communication group set through a division functionusing a code combination, the communication among the devices having thedigital radio function in the corresponding communication group may beperformed in a clear state in which noise and crosstalk are prevented asmuch as possible.

Also, power consumption in the reception standby state may be greatlyreduced through a function of the smart phone and Bluetooth earsethaving the digital radio function in which one cycle including the sleepmode and the auto-polling mode is repetitively performed in thereception standby state.

Also, a user may automatically transmit a voice signal input to areception portion through a radio frequency (RF) transceiver and anantenna without additionally manipulating a push to talk (PTT) buttonand the like for inputting a voice.

Also, since it is possible to remotely control transmission of anotherdevice having the digital radio function and to form a master-slaverelationship between a plurality of devices having the digital radiofunction, voice conversations may be more efficiently performed amongthe devices having the digital radio function in which the master-slaverelationship is formed.

Also, a communication group with other devices having the digital radiofunction within a limited range may be set by, for example, convertingand transmitting communication group setting information into adual-tone multi-frequency (DTMF) signal or transmitting communicationgroup setting information including a certain received signal strengthindicator (RSSI) reference value.

DESCRIPTION OF DRAWINGS

FIG. 1 is a block diagram illustrating components of a smart phonehaving a digital radio function according to one embodiment of thepresent invention.

FIG. 2 is a block diagram illustrating components of a Bluetooth earsethaving a digital radio function according to one embodiment of thepresent invention.

FIGS. 3 and 4 are views illustrating a basic packet and a control INSTpacket of the smart phone or Bluetooth earset having the digital radiofunction according to one embodiment of the present invention.

FIGS. 5 to 7 are communication timing diagrams of the smart phone orBluetooth earset having the digital radio function according to oneembodiment of the present invention.

FIG. 8 is a view illustrating an example of a signal standby status inthe smart phone or Bluetooth earset having the digital radio functionaccording to one embodiment of the present invention.

FIG. 9 is a flowchart illustrating a signal transmission process of thesmart phone or Bluetooth earset having the digital radio functionaccording to one embodiment of the present invention.

FIG. 10 is a flowchart illustrating a signal reception process of thesmart phone or Bluetooth earset having the digital radio functionaccording to one embodiment of the present invention.

FIG. 11 is a flowchart illustrating a process in which full duplexcommunication is performed in the smart phone or Bluetooth earset havingthe digital radio function according to one embodiment of the presentinvention.

FIG. 12 is a flowchart illustrating an embodiment of a communicationgroup setting method of the smart phone or Bluetooth earset having thedigital radio function according to one embodiment of the presentinvention.

FIG. 13 is a flowchart illustrating another example of the communicationgroup setting method of the smart phone or Bluetooth earset having thedigital radio function according to one embodiment of the presentinvention.

FIG. 14 is a view illustrating an example of a dual-tone multi-frequency(DTMF) signal used in the communication group setting method of FIG. 13.

FIG. 15 is a flowchart illustrating still another example of thecommunication group setting method of the smart phone or Bluetoothearset having the digital radio function according to one embodiment ofthe present invention.

FIG. 16 is a view illustrating the smart phone or Bluetooth earsethaving the digital radio function according to one embodiment of thepresent invention which is being operated as a repeater or relay.

FIG. 17 is a view illustrating the smart phone having the digital radiofunction according to one embodiment of the present invention which isbeing operated as a donor radio.

FIG. 18A illustrates an example of using the smart phone having thedigital radio function according to one embodiment of the presentinvention.

FIG. 18B illustrates an example of using the Bluetooth earset having thedigital radio function according to one embodiment of the presentinvention.

FIG. 18C illustrates an example of using the smart phone and theBluetooth earset having the digital radio function according to oneembodiment of the present invention.

MODES OF THE INVENTION

Hereinafter, exemplary embodiments of the present invention will bedescribed in detail with reference to the drawings. Hereinafter, in thedescription and the attached drawings, substantially like elements willbe referred to as like reference numerals and a repetitive descriptionthereof will be omitted. Also, in a description of the embodiments ofthe present invention, a detailed description of well-known functions orcomponents of the related art will be omitted when it is deemed toobscure understanding of the embodiments of the present invention.

It should be understood that the embodiments of the present inventiondiffer from one another but are not mutually exclusive. For example, aparticular shape, structure, and feature disclosed in one embodimentwill be implemented as another embodiment without departing from theconcept and scope of the present invention. Also, it should beunderstood that a position or disposition of each of components includedin the embodiments of the present invention may be changed withoutdeparting from the concept and scope of the present invention.

Accordingly, a following detailed description is not regarded as alimitative meaning, and the scope of the present invention is definedonly through the content of the claims and equivalents thereof on thepremise of an appropriate description. In the drawings, like referencenumerals refer to like or similar functions throughout a variety ofaspects.

As the terms used herein, general terms, which are widely and currentlyused, are selected in consideration of functions in the presentinvention, which may vary according to the intentions of those skilledin the art, precedents, the appearance of new technologies, or the like.Also, in a particular case, the terms arbitrarily selected by theapplicant are present. In this case, a detailed meaning thereof will beset forth in a description of a corresponding part of the presentinvention. Accordingly, the terms used herein should be defined on thebasis of meanings thereof and the content throughout an entirety of thepresent invention instead of simple designation of the terms.

Throughout the specification, when a portion is stated as “including” acomponent, unless defined particularly otherwise, it means that theportion may not exclude another component but may further includeanother component. Also, the terms such as “portion,” “module,” and thelike disclosed herein refer to a unit configured to perform at least onefunction or operation and may be implemented as hardware, software, or acombination thereof.

FIG. 1 is a block diagram illustrating components of a smart phonehaving a digital radio function according to one embodiment of thepresent invention.

As shown in the drawing, a smart phone 100 having a digital radiofunction according to one embodiment of the present invention includes areception portion 110, a first amplification portion 120, ananalog/digital (A/D) converter 130, a control portion 140, a radiofrequency (RF) transceiver 150, a D/A converter 160, a secondamplification portion 170, a voice output portion 180, and an antenna220. Also, the smart phone 100 having the digital radio functionaccording to one embodiment of the present invention may further includea comparator 190, an input portion 200, and a display portion 210.

FIG. 2 is a block diagram illustrating components of a Bluetooth earset100′ having a digital radio function according to one embodiment of thepresent invention. The Bluetooth earset 100′ having the digital radiofunction according to one embodiment of the present invention hascomponents similar to those of the smart phone 100 having the digitalradio function shown in FIG. 1. Due to properties of the Bluetoothearset, the Bluetooth earset 100′ does not include the display portion210 and further includes a Bluetooth module 230 for Bluetoothcommunication with a smart phone and the like.

The reception portion 110 is a portion to which an analog voice signalis input. That is, a user of the smart phone 100 or Bluetooth earset100′ having the digital radio function inputs a voice through thereception portion 110. Also, the reception portion 110 may be a generalmicrophone.

The first amplification portion 120 amplifies an analog voice signalinput through the reception portion 110.

The A/D converter 130 converts the amplified analog voice signal outputby the first amplification portion 120 into a digital voice signal.

The control portion 140 receives and outputs the digital voice signaloutput by the A/D converter 130 to the RF transceiver 150. Also, thecontrol portion 140 outputs the digital voice signal received throughthe antenna 220 and input through the RF transceiver 150. Here, thedigital voice signal received through the antenna 220 corresponds to adigital voice signal which is transmitted from another device having adigital radio function, for example, the smart phone or Bluetooth earsetaccording to the embodiment of the present invention or another radiodevice or is transmitted from another device in addition thereto.

Also, the control portion 140 enables full duplex communication withanother device having a digital radio function by controlling a timesharing function of the antenna 220.

Also, the control portion 140 may set a group of other devices having adigital radio function and capable of performing communication using asharing function by a code combination such that communication may beperformed only among the devices having the digital radio function inthe set group.

The RF transceiver 150 controls inputting of a signal received by thecontrol portion 140 through the antenna 220 and transmission of a signaloutput from the control portion 140 through the antenna 220.

The D/A converter 160 converts the digital voice signal output from thecontrol portion 140 into an analog voice signal.

The second amplification portion 170 amplifies the analog voice signaloutput from the D/A converter 160.

The voice output portion 180 transmits the analog voice signal outputfrom the second amplification portion 170 to the outside. That is, theuser of the smart phone 100 or Bluetooth earset 100′ having the digitalradio function hears a corresponding user voice transmitted from anotherdevice having the digital radio function or another device through thevoice output portion 180. The voice output portion 180 may be a generalspeaker.

The comparator 190 is connected in parallel with the A/D converter 130to an output end of the first amplification portion 120 anddistinguishes whether voice data is present in the amplified analogvoice signal output by the first amplification portion 120. Also, thecontrol portion 140 is connected in parallel with the A/D converter 130and the comparator 190 and automatically outputs a digital voice signalinput from the A/D converter 130 to the RF transceiver 150 according toa signal input from the comparator 190.

That is, since the smart phone 100 or Bluetooth earset 100′ having thedigital radio function determines whether voice data is present in anoutput signal of the first amplification portion 120 using an outputsignal of the comparator 190, and when the voice data is present,automatically outputs the corresponding voice data to the RF transceiver150 to externally transmit the voice data through the antenna 220, theuser of the smart phone 100 or Bluetooth earset 100′ having the digitalradio function may automatically transmit a voice input to the receptionportion 110 to the outside through the antenna 220 without operating thePTT button or the like.

The input portion 200 performs a function of inputting signals includingPTT to the control portion 140 and may include a variety of buttons andthe like including the PTT button.

The display portion 210 is connected to the control portion 140 anddisplays a system setting value and status information of the smartphone 100 having the digital radio function on a screen. That is, theuser of the smart phone 100 having the digital radio function mayperform various settings on the smart phone 100 having the digital radiofunction through the display portion 210 and may visually recognize acurrent setting status and an operation status of the smart phone 100having the digital radio function which is being used.

In the case of the Bluetooth earset 100′ having the digital radiofunction, a smart phone paired with the Bluetooth earset 100′(precisely, an application in connection with the Bluetooth earset 100′installed in the smart phone) accesses the control portion 140 throughBluetooth communication and displays a system setting value and statusinformation of the Bluetooth earset 100′ having the digital radiofunction on a screen. That is, the user of the Bluetooth 100′ having thedigital radio function may perform various settings on the Bluetoothearset 100′ having the digital radio function through the applicationinstalled in the smart phone paired with the Bluetooth earset 100′ andmay visually recognize a current setting status and an operation statusof the Bluetooth earset 100′ having the digital radio function which isbeing used.

Also, the control portion 140 may output a signal output to the RFtransceiver 150 which is divided into a basic packet and a control INSTpacket.

FIGS. 3 and 4 are views illustrating a basic packet and a control INSTpacket of the smart phone 100 or Bluetooth earset 100′ having thedigital radio function according to one embodiment of the presentinvention.

As shown in the drawings, the basic packet is a transmission andreception digital basic frame including voice data, and the control INSTpacket including a control instruction set necessary in addition tovoice data transmission which may be consecutively and separatelytransmitted to the basic packet whenever an instruction occurs.

Also, the basic packet may include a preamble, a starter code, atransmission ID, a reception ID, a pairing code functioning as apassword, a control INST, voice data, and a completion code. The controlINST packet may include a packet delay, a slot number, a slot ranking, amaster, a slave, remote transmission, Reserve 1, and Reserve 2. In anadditional description of the pairing code, when the pairing codescoincide, communication with a device having the digital radio functionis performed.

Also, the master and the slave of the control INST packet includeinformation on a master that distributes a control instruction set andinformation a slave that receives the control instruction setdistributed by the master and include information that the mastertransfers authority of distributing the control instruction set to aparticular slave. This may form a master-slave relationship between twoor more devices having the digital radio function. Also, a masterfunction may be transferred to a particular device having the digitalradio function through a particular device having the digital radiofunction which functions as a master such that communication may beperformed between devices having the digital radio function on the basisthereon.

Also, the remote transmission of the control INST packet may includeinformation on transmission control and exclusive reception of a masterwith respect to a particular slave. Through this, a particular devicehaving the digital radio function which functions as a master mayremotely control a signal transmission and reception function of aparticular device having the digital radio function among other deviceshaving the digital radio function in a communication group, andcommunication among devices having the digital radio function in thecorresponding communication group may be performed on the basis thereof.

Also, a maximum time slot Tn of the basic packet may equal a packetdelay T/a slot number n (here, the slot number n is an integer smallerthan <a maximum transmission velocity/a general voice sampling velocityof 20 kbps> and is extensible through data compression as necessary.)

Also, the slot number n and a slot ranking N are indicated in the slotnumber and the slot ranking of the control INST packet such that when anumber of communicators in the communication group exceeds the slotnumber n, a new communicator may enter the slot number instead of acommunicator of the last ranking N to perform communication (here, acommunicator with a slot number exceeding n in the group may also alwaysperform reception from all the communicators).

Also, FIGS. 5 to 7 are communication timing diagrams of the smart phone100 or Bluetooth earset 100′ having the digital radio function accordingto one embodiment of the present invention. FIG. 5 illustrates anexample of transmitting packets from the smart phone 100 or Bluetoothearset 100′ with ID 01 to another smart phone 100 or Bluetooth earset100′ with ID 02 using a time sharing method.

FIG. 6 illustrates a process in which communication is performed betweenthe smart phone 100 or Bluetooth earset 100′ with ID 01 and the othersmart phone 100 or Bluetooth earset 100′ with ID 02 through one to onetype full duplex communication and time sharing type packettransmission.

FIG. 7 illustrates a process in which communication is performed amongthe smart phones 100 or Bluetooth earsets 100′ with ID 01 to ID nthrough one to n type full duplex communication and time sharing typepacket transmission.

Referring back to FIG. 1, in a standby status for receiving a signalfrom another device having the digital radio function through theantenna 220 or a standby status for receiving an analog voice signalfrom the other device through the reception portion, the control portion140 may remain in a sleep mode for a preset time and then operate in anauto-polling mode for a preset time to repetitively perform conversioninto the sleep mode and the auto-polling mode so as to reduce powerconsumption while standing by for reception.

FIG. 8 illustrates the above and FIG. 8 is a view illustrating anexample of a signal standby status in the smart phone 100 or Bluetoothearset 100′ having the digital radio function according to oneembodiment of the present invention.

As shown in the drawing, the reception standby mode of the smart phone100 or Bluetooth earset 100′ having the digital radio function includesa sleep mode section and an auto-polling section. That is, in thereception standby mode of the smart phone 100 or Bluetooth earset 100′having the digital radio function, the sleep mode section and theauto-polling section form one cycle and the one cycle of the sleep modesection and the auto-polling section is repetitively performed before avoice signal is received from another device having the digital radiofunction. In the embodiment, a set time for maintaining the sleep modeof the reception standby mode is set as 180 ms and a set time formaintaining the auto-polling mode is set as 20 ms such that one cycle isoverall 200 ms and repetitively performed before a voice signal isreceived from another device having the digital radio function.

Also, the other device having the digital radio function mayrepetitively transmit a voice signal for each preset time of 220 ms.Accordingly, since the time of 20 ms in which the auto-polling ismaintained in the reception standby mode of the smart phone 100 orBluetooth earset 100′ is overlapped within a range of 220 ms which isthe set time in which the voice signal is transmitted from the otherdevice having the digital radio function, the smart phone 100 orBluetooth earset 100′ may receive the voice signal transmitted from theother device having the digital radio function and then transmit andreceive a voice signal with the smart phone 100 or Bluetooth earset100′.

Accordingly, the smart phone 100 or Bluetooth earset 100′ having thedigital radio function may greatly reduce power consumption in thereception standby status using the auto-polling method in comparison toan existing reception standby mode of always operating in an activestatus.

Also, the control portion 140 may transmit communication group settinginformation to other devices having the digital radio function within acommunication range or a limited range to allow the smart phone 100 orBluetooth earset 100′ having the digital radio function to set acommunication group with other devices having the digital radiofunction. In order to set the communication group with the other deviceshaving the digital radio function within the limited range, the controlportion 140 may convert the communication group setting information intoa dual-tone multi-frequency (DTMF) signal and transmit the DTMF signalthrough the voice output portion 180 or may transmit communication groupsetting information including a certain received signal strengthindicator (RSSI) value through the antenna 220. These operations will bedescribed below in detail with reference to FIGS. 13 to 15.

As seen from the above components, the smart phone 100 or Bluetoothearset 100′ having the digital radio function according to oneembodiment of the present invention may perform transmission andreception at the same time through the full duplex communicationfunction of the control portion 140 using a method of time sharing andthe like.

Also, since communication is available among devices having the digitalradio function in a communication group set through a division functionof the control portion 140 using a code combination, the communicationamong the devices having the digital radio function in the correspondingcommunication group may be performed in a clear state in which noise andcrosstalk are prevented as much as possible.

Also, power consumption in the reception standby status may be greatlyreduced through a function of the control portion 140 in which one cycleincluding the sleep mode and the auto-polling mode is repetitivelyperformed in the reception standby status.

Also, through the comparator 190 and a function of the control portion140 in which whether an analog voice signal exists in a signal inputthrough the reception portion 110 using a signal of the comparator 190,the user of the smart phone 100 or Bluetooth earset 100′ having thedigital radio function may automatically transmit a voice signal inputto the reception portion 110 through the RF transceiver 150 and theantenna 220 of the smart phone 100 or Bluetooth earset 100′ having thedigital radio function without an additional manipulation on a PTTbutton or the like for inputting a voice.

Next, a wireless communication method of the smart phone 100 orBluetooth earset 100′ having the digital radio function according to oneembodiment of the present invention will be described with reference toFIGS. 9 to 17.

FIG. 9 is a flowchart illustrating a signal transmission process of thesmart phone 100 or Bluetooth earset 100′ having the digital radiofunction according to one embodiment of the present invention.

As shown in the drawing, in operation S110, the reception portion 110stands by for inputting of an analog voice signal.

In operation S120, the control portion 140 determines whether a PTTsignal is input through the input portion 200 or whether a voice datapresence signal is input through the comparator 190.

In operation S130, when it is determined in operation S120 that the PTTsignal is input through the input portion 200 or the voice data presencesignal is input through the comparator 190, the control portion 140outputs ID and a pairing code of the smart phone 100 or Bluetooth earset100′ having the digital radio function to the RF transceiver 150.

In operation S140, the control portion 140 outputs a digital voicesignal obtained by converting, by the A/D converter 130, the signalinput through the reception portion 110 to the RF transceiver 150.

In operations S130 and S140, the ID and pairing code of the smart phone100 or Bluetooth earset 100′ having the digital radio function and thedigital voice signal are transmitted to another device having thedigital radio function through the antenna 220.

In operation S150, the control portion 140 determines whether inputtingof the PTT signal is stopped or whether inputting of the voice datapresence signal through the comparator 190 is stopped.

In operation S160, when it is confirmed in operation S150 that inputtingof the PTT signal is stopped or inputting of the voice data presencesignal through the comparator 190 is stopped, the control portion 140outputs a transmission completion code to the RF transceiver 150.Accordingly, the transmission completion signal is transmitted to theother device having the digital radio function through the antenna 220of the smart phone 100 or Bluetooth earset 100′ having the digital radiofunction such that a transmission routine between the devices having thedigital radio function is finished.

FIG. 10 is a flowchart illustrating a signal reception process of thesmart phone 100 or Bluetooth earset 100′ having the digital radiofunction according to one embodiment of the present invention.

As shown in the drawing, in operation S210, the antenna 220 stands byfor inputting of a digital voice signal.

In operation S220, the control portion 140 determines whether a signalreceived through the antenna 220 includes ID and a pairing code ofanother device having the digital radio function.

In operation S230, when it is determined in operation S220 that thesignal received through the antenna 220 includes the ID and pairing codeof the other device having the digital radio function, the controlportion 140 displays the ID and pairing code of the other device havingthe digital radio function through the display portion 210.

In operation S240, the control portion 140 outputs an input digitalvoice signal of the other device having the digital radio function tothe D/A converter 160, and an analog voice signal obtained throughconversion performed by the D/A converter 160 is output through thevoice output portion 180.

In operation S250, the control portion 140 determines whether atransmission signal of the other device having the digital radiofunction includes a transmission completion code.

In operation S260, when it is confirmed that the transmission signal ofthe other device having the digital radio function includes thetransmission completion code, the control portion 140 finishes a signalreception operation.

FIG. 11 is a flowchart illustrating a process in which full duplexcommunication is performed in the smart phone or Bluetooth earset havingthe digital radio function according to one embodiment of the presentinvention.

First, in a description of a transmission routine, as shown in thedrawing, in operation S310, the reception portion 110 stands by forinputting of an analog voice signal.

In operation S320, the control portion 140 determines whether a PTTsignal is input through the input portion 200 or whether a voice datapresence signal is input through the comparator 190.

In operation S330, when the PTT signal is input or the voice datapresence signal is input, the control portion 140 outputs a basic packetto the RF transceiver 150.

In operation S340, it is determined whether the control portion 140generates a control INST.

In operation S350, when it is determined that the control portion 140generates the control INST, the basic packet including a control INSTpacket is output to the RF transceiver 150. Otherwise, in operationS355, it is determined that the control portion 140 does not generatethe control INST, the basic packet is continuously output to the RFtransceiver 150.

In operation S360, the control portion 140 determines whethertransmission is finished, that is, determines whether a conditioncorresponds to a status in which another device having the digital radiofunction finishes reception.

Also, when the control portion 140 determines that transmission isfinished, there is performed an operation before the operation ofstanding by for inputting of the analog voice signal through thereception portion 110. When the control portion 140 does not determinethat the transmission is finished, there is performed an operationbefore the operation of outputting, by the control portion 140, thebasic packet to the RF transceiver 150 when the PTT signal is input orthe voice data presence signal is input.

Next, in a description of a reception routine, in operation S310-1, theantenna 220 stands by for inputting of a digital voice signal.

In operation S320-1, the control portion 140 determines whether a signalreceived through the antenna 220 includes ID and a pairing code ofanother device having the digital radio function.

In operation S330-1, when it is determined that the signal receivedthrough the antenna 220 includes the ID and pairing code of the otherdevice having the digital radio function, the control portion 140determines whether a control INST is received with the correspondingsignal.

In operation S340-1, when the control portion 140 determines that thecontrol INST is also received, the received INST is executed.

In operation S350-1, as the control portion 140 executes the controlINST, received packet information is output through the display portion210 and voice data is output through the voice output portion 180.

In operation S360-1, the control portion 140 determines whetherreception is finished, that is, determines whether a conditioncorresponds to a status in which another device having the digital radiofunction finishes transmission.

Also, when the control portion 140 determines that the reception isfinished, there is performed an operation before the operation ofstanding by, by the antenna 220, for inputting of the digital voicesignal. When the control portion 140 does not determine that thereception is finished, there is performed an operation before theoperation of determining, by the control portion 140, whether thecontrol INST is also received with the corresponding signal when thesignal received through the antenna 220 includes the ID and pairing codeof the other device having the digital radio function.

FIG. 12 is a flowchart illustrating an embodiment of a communicationgroup setting method of the smart phone 100 or Bluetooth earset 100′having the digital radio function according to one embodiment of thepresent invention.

In operation S410, the smart phone 100 or Bluetooth earset 100′ whichneeds to set a communication group is set to be in a control mode.

In operation S420, the control portion 140 of the smart phone 100 orBluetooth earset 100′ determines communication group setting informationof the communication group to be set. The communication group settinginformation may include, for example, ID, a pairing code, a master, aslave, a control INST, and the like of a wireless communication deviceto be included in the communication group.

In operation S430, the control portion 140 of the smart phone 100 orBluetooth earset 100′ transmits the communication group settinginformation through the RF transceiver 150 and the antenna 220.

In operation S440, other devices having the digital radio functionreceive the communication group setting information and checks thereceived communication group setting information when approval (orimplied approval) of corresponding users for joining the group ispresent.

In operation S490, the other devices having the digital radio functionstore and set the received communication group setting information suchthat a communication group including the smart phone 100 or Bluetoothearset 100′ and the other devices having the digital function is set.

Also, the smart phone 100 or Bluetooth earset 100′ and the other deviceshaving the digital radio function are converted into a reception standbymode. Then, communication becomes available among the devices having thedigital radio function which are included in the communication group.

According to the communication group setting method according to theembodiment of FIG. 12, a communication group may be set among deviceshaving the digital radio function within a range in which thecommunication group setting information is transmittable, that is,within a communication range of the smart phone 100 or Bluetooth earset100′ intended to set a communication group. However, on a case by casebasis, it is necessary to set a communication group among devices havingthe digital radio function in a so-called private communication group,that is, within a limited range smaller than a wireless communicationrange. For example, a communication group is set which includes peoplegathered within several meters to several ten meters. According to thecommunication group setting method according to the embodiment of FIG.12, since the communication group setting information is transferred toall devices having the digital radio function within a communicationrange, an undesirable person may be included in the communication groupor a person not be included for security may be included in thecommunication group. Other embodiments of the present invention providecommunication group setting methods capable of effectively setting acommunication group among wireless communication devices within alimited range smaller than a wireless communication range.

FIG. 13 is a flowchart illustrating another embodiment of acommunication group setting method of the smart phone 100 or Bluetoothearset 100′ having the digital radio function according to oneembodiment of the present invention.

In operation S410, the smart phone 100 or Bluetooth earset 100′ whichneeds to set a communication group is set to be in a control mode.

In operation S420, the control portion 140 of the smart phone 100 orBluetooth earset 100′ determines communication group setting informationof the communication group to be set. The communication group settinginformation may include, for example, ID, a pairing code, a master, aslave, a control INST, and the like of a device having the digital radiofunction to be included in the communication group.

In operation S510, the control portion 140 of the smart phone 100 orBluetooth earset 100′ determines whether communication group setting isprimary group setting. Here, when a communication group is already set,the setting of the communication group may not be determined as primarygroup setting. When a communication group is not currently set, settingmay be determined as primary group setting.

When the setting is not primary group setting, equal to the embodimentof FIG. 12, the control portion 140 of the smart phone 100 or Bluetoothearset 100′ transmits the communication group setting informationthrough the RF transceiver 150 and the antenna 220 (S430). In this case,operation S430 may be, for example, transmitting new communication groupsetting information to devices having the digital radio function in analready set communication group.

When the setting is the primary group setting, the control portion 140of the smart phone 100 or Bluetooth earset 100′ transmits thecommunication group setting information to devices having the digitalradio function within a limited range using a DTMF signal by performingoperation S520 as follows. In the embodiment, the DTMF signal istransmitted as a sound through the voice output portion 180, forexample, a speaker. Here, since a sound arrives within only a limiteddistance, it is possible to set a communication group among the deviceshaving the digital radio function within the limited range.

In operation S520, the control portion 140 of the smart phone 100 orBluetooth earset 100′ checks whether an external speaker and amicrophone of the smart phone 100 or Bluetooth earset 100′ are beingturned on. Since it is impossible to transmit a sound when the externalspeaker and microphone are not present or not being turned on, thecontrol portion 140 of the smart phone 100 or Bluetooth earset 100′transmits the communication group setting information through the RFtransceiver 150 and the antenna 220 (S430).

When the external speaker and microphone are being turned on, inoperation S530, the control portion 140 of the smart phone 100 orBluetooth earset 100′ converts the communication group settinginformation into a DTMF signal. For example, when the DTMF signal hasfrequency components of a 4×4 matrix, a hexadecimal value may beexpressed with an overlapping tone (a combination of two frequencies).FIG. 14 is a view illustrating an example of the DTMF signal, in whicheach row indicates a low frequency component and each column indicates ahigh frequency component. As shown in the drawing, a hexadecimal numberof 0 to F may be expressed with frequency components of a 4×4 matrix.For example, when eight hexadecimal data such as ID, a pairing code, amaster, a slave, a control INST, and the like of wireless communicationdevices to be included in a communication group are necessary ascommunication group setting information, eight DTMF signals (overlappingtones) are generated.

In operation S540, the control portion 140 of the smart phone 100 orBluetooth earset 100′ transmits the DTMF signals to the outside throughthe voice output portion 180. For example, eight overlapping tones aresequentially transmitted through the voice output portion 180.

Then, in operation S550, other devices having the digital radio functionnear the smart phone 100 or Bluetooth earset 100′ are allowed to receivethe DTMF signals through the reception portion 110, for example, amicrophone. According to a volume of a sound output through the voiceoutput portion 180 of the smart phone 100 or Bluetooth earset 100′ andsensitivity of the reception portion 110 of the other devices having thedigital radio function, the DTMF signal may be transmitted within arange of several meters to more than a dozen meters. Accordingly, acommunication group of devices having the digital radio function withina range of several meters to more than a dozen meters may be set. When afrequency of the DTMF signal is in an ultrasonic band, it is possible totransmit or receive the DTMF signal at a place with a loud noise around.

In operation S560, the control portion 140 of each of the other deviceshaving the digital radio function which receives the DTMF signal obtainscommunication group setting information by decoding the received DTMFsignal when user's approval for joining the group (or implied approval)is present. For example, the control portion 140 of each of the otherdevices having the digital radio function may obtain the communicationgroup setting information by restoring corresponding hexadecimal datafrom the received DTMF signal.

In operation S490, the other devices having the digital radio functionstore and set the obtained communication group setting information suchthat a communication group including the smart phone 100 or Bluetoothearset 100′ and the other devices having the digital function is set.

Also, the smart phone 100 or Bluetooth earset 100′ and the other deviceshaving the digital radio function are converted into a reception standbymode. Then, communication becomes available among the devices having thedigital radio function which are included in the communication group.

FIG. 15 is a flowchart illustrating another embodiment of acommunication group setting method of the smart phone 100 or Bluetoothearset 100′ having the digital radio function according to oneembodiment of the present invention.

In operation S410, the smart phone 100 or Bluetooth earset 100′ whichneeds to set a communication group is set to be in a control mode.

In operation S420, the control portion 140 of the smart phone 100 orBluetooth earset 100′ determines communication group setting informationof the communication group to be set. The communication group settinginformation may include, for example, ID, a pairing code, a master, aslave, a control INST, and the like of a wireless communication deviceto be included in the communication group.

In operation S510, the control portion 140 of the smart phone 100 orBluetooth earset 100′ determines whether communication group setting isprimary group setting. Here, when a communication group is already set,the setting of the communication group may not be determined as primarygroup setting. When a communication group is not currently set, settingmay be determined as primary group setting.

When the setting is not primary group setting, equal to the embodimentof FIG. 12, the control portion 140 of the smart phone 100 or Bluetoothearset 100′ transmits the communication group setting informationthrough the RF transceiver 150 and the antenna 220 (S430). In this case,operation S430 may be, for example, transmitting new communication groupsetting information to devices having the digital radio function in analready set communication group.

In the case of the primary group setting, in operation S520, the controlportion 140 of the smart phone 100 or Bluetooth earset 100′ checkswhether an external speaker and a microphone of the smart phone 100 orBluetooth earset 100′ are being turned on. When the external speaker andmicrophone are being turned on, equal to the embodiment of FIG. 13, thecontrol portion 140 of the smart phone 100 or Bluetooth earset 100′converts the communication group setting information into a DTMF signal(S530) and transmits the DTMF signal to the outside through the voiceoutput portion 180 (S540).

Since it is impossible to use the DTMF signal when the external speakerand microphone are not present or not being turned on in operation S520,operation S610 is performed such that the control portion 140 of thesmart phone 100 or Bluetooth earset 100′ transmits communication groupsetting information including a certain RSSI reference value. Then, theother devices having the digital radio function which receive the RSSIreference value may compare the RSSI reference value with a measuredRSSI value and determine whether to join the communication groupaccording to a result of comparison. Since the measured RSSI valuedepends on a distance, it is possible to set a communication group ofdevices having the digital radio function within a limited range.

According to an embodiment, regardless of whether the external speakerand microphone are usable, an RSSI value may be used without using theDTMF signal. In this case, in a flowchart of FIG. 15, operations S520 toS560 may be omitted. When primary group setting is performed inoperation S510, operation S610 may be performed immediately.

In operation S610, the control portion 140 of the smart phone 100 orBluetooth earset 100′ determines whether an RSSI value is used forsetting a communication group. Here, according to a user's instructionor presets, whether to use the RSSI value may be determined. When it isnot determined to use the RSSI value, the control portion 140 of thesmart phone 100 or Bluetooth earset 100′ transmits the communicationgroup setting information through the RF transceiver 150 and the antenna220 (S430).

When it is determined to use the RSSI value, the control portion 140 ofthe smart phone 100 or Bluetooth earset 100′ allows a certain RSSIreference value to be included in the communication group settinginformation. As described above, the communication group settinginformation may include a control INST. For example, the RSSI referencevalue may be included in an area of Reserve 1 or Reserve 2 of thecontrol INST packet shown in FIG. 4.

In operation S630, the control portion 140 of the smart phone 100 orBluetooth earset 100′ transmits the communication group settinginformation including the RSSI reference value through the RFtransceiver 150 and the antenna 220.

Then, in operation S640, the other devices having the digital radiofunction receive the communication group setting information includingthe RSSI reference value through the antenna 220, and the controlportion 140 of each of the other devices having the digital radiofunction extracts the RSSI reference value from the receivedcommunication group setting information while measuring an RSSI value ofa received signal.

In operation S650, the control portion 140 of each of the other deviceshaving the digital radio function compares the measured RSSI value withthe RSSI reference value extracted from the communication group settinginformation and determines whether the measured RSSI value is greaterthan or equal to the RSSI reference value.

When an RSSI value measured while a device having the digital radiofunction on a transmitting side is very close to a device having thedigital radio function on a receiving side is referred to as a maximumRSSI value, an RSSI value measured at a short distance of several tenmeters is 90 to 95% the maximum RSSI value and an RSSI value measured ata maximum communication distance of the device having the digital radiofunction is 5 to 10% the maximum RSSI value. Accordingly, the RSSIreference value may be determined as an adequate value according to arange for setting a communication group and may be changeable accordingto user's settings. For example, when the range for setting thecommunication group is several ten meters, the RSSI reference value maybe determined as 90% the maximum RSSI value.

When it is determined in operation S650 that the measured RSSI value isgreater than or equal to the RSSI reference value, in operation S660,the control portion 140 of each of the other devices having the digitalradio function checks the received communication group settinginformation and obtains the communication group setting information suchas ID, a pairing code, a master, a slave, a control INST, and the likeof a wireless communication device to be included in the communicationgroup.

Then, in operation S490, the other devices having the digital radiofunction store and set the communication group setting information suchthat a communication group including the smart phone 100 or Bluetoothearset 100′ and the other devices having the digital function is set.

Also, the smart phone 100 or Bluetooth earset 100′ and the other deviceshaving the digital radio function are converted into a reception standbymode. Then, communication becomes available among the devices having thedigital radio function which are included in the communication group.

FIG. 16 is a view illustrating the smart phone 100 or Bluetooth earset100′ having the digital radio function according to one embodiment ofthe present invention which is being operated as a repeater or relay.

A repeater means a relaying function of performing waveform shaping oramplification such as reproducing a reduced signal, increasing outputthereof, and the like to extend transmissions of a wireless signal to betransmitted.

A relay means a function of extending a communication distance orincreasing a number of communication terminals by providing one or morerepeaters between a sending end and a receiving end.

In the embodiment of the present invention, the smart phone 100 orBluetooth earset 100′ may be set to be in a repeater mode. In therepeater mode, the control portion 140 may change transmission andreception ID, amplify a wireless signal received through the antenna 220with a certain level of power, and transmit the amplified signal throughthe antenna 220. Here, two or more smart phones 100 or Bluetooth earsets100′ receiving a wireless signal may compare levels of received powerthrough mutual communication such that a wireless communication devicehaving a highest level of power may perform a repeater function.

For example, referring to FIG. 14, it is assumed that when smart phones100 or Bluetooth earsets 100′ ID 1, ID 2, and ID 3 720, 730, and 740(hereinafter, referred to as devices ID 1, ID 2, and ID 3 720, 730, and740) are set to be in a repeater mode, a device A 710 having the digitalradio function having the digital radio function transmits a wirelesssignal. A device B 750 having the digital radio function is present at along distance from the device A 710 and may not directly receive awireless signal.

The devices ID 1, ID 2, and ID 3 720, 730, 740 receive a signal from thedevice A 710 and compare levels of received power through mutualcommunication. Then, the device ID 1 720 having a highest level of poweramplifies and retransmits a signal from the device A 710. The devices ID2 and ID 3 730 and 740 each receive the signal transmitted by the deviceID 1 720 and compare levels of received power through mutualcommunication. Then, the device ID 3 740 having a highest level ofreceived power amplifies and retransmits a signal from the device ID 1720. Then, the device B 750 receives a wireless signal from the deviceID 3 740. On a case by case basis, the device B 750 may receive a signaltransmitted by the device ID 1 702. Here, since a level of power of thesignal transmitted from the device ID 3 740 is higher, the signaltransmitted from the device ID 3 740 may be selected.

After all, the signal transmitted by the device A 710 is transmitted tothe device B 750 through the ID 1 720 and the device ID 3 740. On theother hand, the signal transmitted by the device B 750 is transmitted tothe device A 710 through the ID 3 740 and the device ID 1 720.

FIG. 17 is a view illustrating the smart phone 100 having the digitalradio function according to one embodiment of the present inventionwhich is being operated as a donor radio.

The donor radio means a function of transmitting a signal outside avoice-over Internet protocol (VoIP) network to an inside of the VoIPnetwork through VoIP equipment such as a gateway, a switch, a router,and the like or receiving a signal from the VoIP network andtransmitting the signal to the outside of the VoIP network through theVoIP equipment. Through the function, the smart phone 100 or Bluetoothearset 100′ having the digital radio function according to theembodiment of the present invention may communicate with wirelesscommunication devices in any region in the world connected to the VoIPnetwork.

In the embodiment of the present invention, to allow the smart phone 100having the digital radio function to operate as a donor radio, thecontrol portion 140 may transmit a signal received from the VoIPequipment such as a gateway, a switch, a router, and the like through acellular data network or a WiFi network to another device having thedigital radio function through the antenna 220 or transmit a signalreceived from the other device having the digital radio function throughantenna 220 to the inside of the VoIP network using the VoIP equipmentsuch as the gateway, switch, router, and the like through the cellulardata network or WiFi network.

For example, referring to FIG. 17, a first smart phone 100 811 of afirst communication group 810 is connected to a second smart phone 100821 of a second communication group 820 passing the VoIP equipment suchas the gateway, switch, router, and the like through the cellular datanetwork or WiFi network. That is, the first smart phone 100 811 and thesecond smart phone 100 821 operate donor radios. The first smart phone100 811 and the second smart phone 100 821 may mutually transmit andreceive a VoIP signal passing the VoIP equipment such as the gateway,switch, router, and the like through the cellular data network or WiFinetwork.

When a VoIP signal is received from the second smart phone 100 821 ofthe second communication group 820, the first smart phone 100 811transmits the corresponding signal to other devices having the digitalradio function in the first communication group 810. When signals arereceived from the other devices having the digital radio function in thefirst communication group 810, the first smart phone 100 811 transmitsthe corresponding signals to the second smart phone 100 821 of thesecond communication group 820 through the VoIP network.

When a VoIP signal is received from the first smart phone 100 811 of thefirst communication group 810, the second smart phone 100 821 transmitsthe corresponding signal to other devices having the digital radiofunction in the second communication group 820. When signals arereceived from the other devices having the digital radio function in thesecond communication group 820, the second smart phone 100 821 transmitsthe corresponding signals to the first smart phone 100 811 of the firstcommunication group 810 through the VoIP network.

Accordingly, the signal transmitted by the device having the digitalradio function in the first communication group 810 is sent to thedevices having the digital radio function in the second communicationgroup 820 through the first smart phone 100 811, the VoIP network, andthe second smart phone 100 821, and the signal transmitted by the devicehaving the digital radio function in the second communication group 820is sent to the devices having the digital radio function in the firstcommunication group 810 through the second smart phone 100 821, the VoIPnetwork, and the first smart phone 100 811.

Accordingly, the devices having the digital radio function in the firstcommunication group 810 and the devices having the digital radiofunction in the second communication group 820 may communicate with eachother like belonging to one communication group.

FIG. 18A illustrates an example of using the smart phone 100 having thedigital radio function according to one embodiment of the presentinvention. Referring to FIG. 18A, a user may perform communication withanother device having the digital radio function using the smart phone100 having the digital radio function according to the embodiment of thepresent invention and an existing general Bluetooth earset E, on a caseby case basis, without the existing general Bluetooth earset E.

FIG. 18B illustrates an example of using the Bluetooth earset 100′having the digital radio function according to one embodiment of thepresent invention. Referring to FIG. 18B, a user may performcommunication with another device having the digital radio functionusing the Bluetooth earset 100′ having the digital radio functionaccording to the embodiment of the present invention and an existinggeneral smart phone M, on a case by case basis, without the existinggeneral smart phone M.

FIG. 18C illustrates an example of using the smart phone 100 and theBluetooth earset 100′ having the digital radio function according to oneembodiment of the present invention. Referring to FIG. 18C, a user mayperform communication with another device having the digital radiofunction by selectively using one of the smart phone 100 having thedigital radio function according to the embodiment of the presentinvention and the Bluetooth earset 100′ having the digital radiofunction according to the embodiment of the present invention.

The exemplary embodiments of the present invention have been describedabove. It should be understood by one of ordinary skill in the art thatthe present invention may be implemented as a modified form withoutdeparting from the essential features of the present invention.Therefore, the disclosed embodiments should be considered not in alimitative view but in a descriptive view. The scope of the presentinvention will be shown in the claims not in the above description, andall differences within an equivalent range thereof should be interpretedas being included in the present invention.

1. A smart phone having a digital radio function, comprising: a reception portion to which an analog voice signal is input; a first amplification portion amplifying the analog voice signal input through the reception portion; an analog/digital (A/D) converter converting the amplified analog voice signal output by the first amplification portion into a digital voice signal; a control portion receiving and outputting the digital voice signal output from the A/D converter and outputting a digital voice signal received and input through an antenna; a radio frequency (RF) transceiver controlling inputting the signal received through the antenna to the control portion and transmitting the signal output from the control portion through the antenna; a digital/analog (D/A) converter converting the digital voice signal output from the control portion into an analog voice signal; a second amplification portion amplifying the analog voice signal output from the D/A converter; and a voice output portion externally transmitting the analog voice signal output from the second amplification portion, wherein the control portion enables full duplex communication with another wireless communication device by controlling a time sharing function of the antenna.
 2. The smart phone of claim 1, wherein the control portion sets a group of other devices having the digital radio function, which are capable of performing communication through a sharing function using a code combination, and enables communication only among devices having the digital radio function in the set group.
 3. The smart phone of claim 1, further comprising a comparator connected to an output end of the first amplification portion with the A/D converter in parallel to determine whether voice data is present in the amplified analog voice signal output from the first amplification portion, wherein the control portion is connected to the A/D converter and the comparator in parallel and automatically outputs the digital voice signal input from the A/D converter to the RF transceiver according to a signal input from the comparator.
 4. The smart phone of claim 1, further comprising an input portion for inputting a signal including a push to talk (PTT) to the control portion.
 5. The smart phone of claim 1, further comprising a display portion which is connected to the control portion and displays a system setting value and status information of the smart phone having the digital radio function on a screen.
 6. The smart phone of claim 1, wherein the control portion outputs a signal to the RF transceiver while dividing the signal into a basic packet and a control INST packet, the basic packet is a transmission and reception digital basic frame including voice data, and the control INST packet is a frame including a control instruction set necessary in addition to transmission of the voice data and additionally and separately transmitted to the basic packet whenever an instruction occurs.
 7. The smart phone of claim 6, wherein the basic packet comprises a preamble, a starter code, a transmission ID, a reception ID, a pairing code, a control INST, voice data, and a completion code, and the control INST packet comprises a packet delay, a slot number, a slot ranking, a master, a slave, remote transmission, Reserve 1, and Reserve
 2. 8. The smart phone of claim 7, wherein the master and the slave of the control INST packet comprise information on a master that distributes a control instruction set and information a slave that receives the control instruction set distributed by the master, and comprise information that the master transfers authority of distributing the control instruction set to a particular slave.
 9. The smart phone of claim 7, wherein the remote transmission of the control INST packet comprises information on transmission control and exclusive reception of a master with respect to a particular slave.
 10. The smart phone of claim 7, wherein a slot number n and a slot ranking N are indicated in the slot number and the slot ranking of the control INST packet such that when a number of communicators in the communication group exceeds the slot number n, a new communicator is capable of entering the slot number while replacing a communicator of a last ranking N to perform communication (here, a communicator with a slot number exceeding n in the group also always perform reception from all the communicators).
 11. The smart phone of claim 6, wherein a maximum time slot Tn of the basic packet equals a packet delay T/a slot number n (here, the slot number n is an integer smaller than <a maximum transmission velocity/a general voice sampling velocity of 20 kbps> and is extensible through data compression as necessary.)
 12. The smart phone of claim 1, wherein in a standby status for receiving a signal from another device having the digital radio function through the antenna or a standby status for receiving an analog voice signal from the other device through the reception portion, the control portion remains in a sleep mode for a preset time and then operates in an auto-polling mode for a preset time to repetitively perform conversion into the sleep mode and the auto-polling mode so as to reduce power consumption while standing by for reception.
 13. The smart phone of claim 1, wherein the control portion transmits communication group setting information to other devices having the digital radio function within a limited range so as to set a communication group with the other devices having the digital radio function.
 14. The smart phone of claim 13, wherein the control portion converts the communication group setting information into a dual-tone multi-frequency (DTMF) signal and transmits the DTMF signal through the voice output portion, and wherein when a DTMF signal is input through the reception portion, the control portion obtains communication group setting information by decoding the input DTMF signal.
 15. The smart phone of claim 14, wherein the DTMF signal has frequency components of a 4×4 matrix.
 16. The smart phone of claim 13, wherein the control portion transmits the communication group setting information including a certain received signal strength indicator (RSSI) reference value through the antenna, and wherein when communication group setting information is received through the antenna, the control portion extracts an RSSI reference value from the received communication group setting information and checks the received communication setting information when a measured RSSI value is greater than or equal to the extracted RSSI reference value.
 17. The smart phone of claim 16, wherein the communication group setting information comprises a control INST packet, and the RSSI reference value is included in an area of Reserve 1 or Reserve 2 of the control INST packet.
 18. The smart phone of claim 13, wherein the communication group setting information comprises ID, a pairing code, a master, a slave, and a control INST of another device having the digital radio function to be included in the communication group.
 19. The smart phone of claim 13, wherein the control portion amplifies a signal received through the antenna and transmits the amplified signal through the antenna so as to allow the smart phone having the digital radio function to perform a repeater or relay function.
 20. The smart phone of claim 13, wherein the control portion transmits a signal received from the other device having the digital radio function to a voice-over Internet protocol (VoIP) network and transmits a signal received through the VoIP network to another device having the digital radio function so as to allow the smart phone having the digital radio function to operate as a donor radio.
 21. A Bluetooth earset having a digital radio function, comprising: a reception portion to which an analog voice signal is input; a first amplification portion amplifying the analog voice signal input through the reception portion; an A/D converter converting the amplified analog voice signal output by the first amplification portion into a digital voice signal; a control portion receiving and outputting the digital voice signal output from the A/D converter and outputting a digital voice signal received and input through an antenna; a RF transceiver controlling inputting the signal received through the antenna to the control portion and transmitting the signal output from the control portion through the antenna; a D/A converter converting the digital voice signal output from the control portion into an analog voice signal; a second amplification portion amplifying the analog voice signal output from the D/A converter; and a voice output portion externally transmitting the analog voice signal output from the second amplification portion, wherein the control portion enables full duplex communication with another wireless communication device by controlling a time sharing function of the antenna.
 22. The Bluetooth earset of claim 21, wherein the control portion sets a group of other devices having the digital radio function, which are capable of performing communication through a sharing function using a code combination, and enables communication only among devices having the digital radio function in the set group.
 23. The Bluetooth earset of claim 21, further comprising a comparator connected to an output end of the first amplification portion with the A/D converter in parallel to determine whether voice data is present in the amplified analog voice signal output from the first amplification portion, wherein the control portion is connected to the A/D converter and the comparator in parallel and automatically outputs the digital voice signal input from the A/D converter to the RF transceiver according to a signal input from the comparator.
 24. The Bluetooth earset of claim 21, further comprising an input portion for inputting a signal including a PTT to the control portion.
 25. The Bluetooth earset of claim 21, wherein a smart phone paired with the Bluetooth earset is connected to the control portion and displays a system setting value and status information of the Bluetooth earset having the digital radio function on a screen.
 26. The Bluetooth earset of claim 21, wherein the control portion outputs a signal to the RF transceiver while dividing the signal into a basic packet and a control INST packet, the basic packet is a transmission and reception digital basic frame including voice data, and the control INST packet is a frame including a control instruction set necessary in addition to transmission of the voice data and additionally and separately transmitted to the basic packet whenever an instruction occurs.
 27. The Bluetooth earset of claim 26, wherein the basic packet comprises a preamble, a starter code, a transmission ID, a reception ID, a pairing code, a control INST, voice data, and a completion code, and the control INST packet comprises a packet delay, a slot number, a slot ranking, a master, a slave, remote transmission, Reserve 1, and Reserve
 2. 28. The Bluetooth earset of claim 27, wherein the master and the slave of the control INST packet comprise information on a master that distributes a control instruction set and information a slave that receives the control instruction set distributed by the master, and comprise information that the master transfers authority of distributing the control instruction set to a particular slave.
 29. The Bluetooth earset of claim 27, wherein the remote transmission of the control INST packet comprises information on transmission control and exclusive reception of a master with respect to a particular slave.
 30. The Bluetooth earset of claim 27, wherein a slot number n and a slot ranking N are indicated in the slot number and the slot ranking of the control INST packet such that when a number of communicators in the communication group exceeds the slot number n, a new communicator is capable of entering the slot number while replacing a communicator of a last ranking N to perform communication (here, a communicator with a slot number exceeding n in the group also always perform reception from all the communicators).
 31. The Bluetooth earset of claim 26, wherein a maximum time slot Tn of the basic packet equals a packet delay T/a slot number n (here, the slot number n is an integer smaller than <a maximum transmission velocity/a general voice sampling velocity of 20 kbps> and is extensible through data compression as necessary.)
 32. The Bluetooth earset of claim 21, wherein in a standby status for receiving a signal from another device having the digital radio function through the antenna or a standby status for receiving an analog voice signal from the other device through the reception portion, the control portion remains in a sleep mode for a preset time and then operates in an auto-polling mode for a preset time to repetitively perform conversion into the sleep mode and the auto-polling mode so as to reduce power consumption while standing by for reception.
 33. The Bluetooth earset of claim 21, wherein the control portion transmits communication group setting information to other devices having the digital radio function within a limited range so as to set a communication group with the other devices having the digital radio function.
 34. The Bluetooth earset of claim 33, wherein the control portion converts the communication group setting information into a DTMF signal and transmits the DTMF signal through the voice output portion, and wherein when a DTMF signal is input through the reception portion, the control portion obtains communication group setting information by decoding the input DTMF signal.
 35. The Bluetooth earset of claim 34, wherein the DTMF signal has frequency components of a 4×4 matrix.
 36. The Bluetooth earset of claim 33, wherein the control portion transmits the communication group setting information including a certain RSSI reference value through the antenna, and wherein when communication group setting information is received through the antenna, the control portion extracts an RSSI reference value from the received communication group setting information and checks the received communication setting information when a measured RSSI value is greater than or equal to the extracted RSSI reference value.
 37. The Bluetooth earset of claim 36, wherein the communication group setting information comprises a control INST packet, and the RSSI reference value is included in an area of Reserve 1 or Reserve 2 of the control INST packet.
 38. The Bluetooth earset of claim 33, wherein the communication group setting information comprises ID, a pairing code, a master, a slave, and a control INST of another device having the digital radio function to be included in the communication group.
 39. The Bluetooth earset of claim 33, wherein the control portion amplifies a signal received through the antenna and transmits the amplified signal through the antenna so as to allow the Bluetooth earset having the digital radio function to perform a repeater or relay function. 